The M56 Scorpion and M50 Ontos were light weight air-portable Anti-Tank Self-Propelled gun vehicles designed and built in the 1950s. They entered service with the US Army and the US Marines. Too late for the Korean War, both were first used in combat in 1965 and were used in roles that they were not intended … Continue reading M56 Scorpion and M50 Ontos in Combat